2 * tps65910-irq.c -- TI TPS6591x
4 * Copyright 2010 Texas Instruments Inc.
6 * Author: Graeme Gregory <gg@slimlogic.co.uk>
7 * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/bug.h>
20 #include <linux/device.h>
21 #include <linux/interrupt.h>
22 #include <linux/irq.h>
23 #include <linux/gpio.h>
24 #include <linux/mfd/tps65910.h>
25 #include <linux/wakelock.h>
26 #include <linux/kthread.h>
28 static inline int irq_to_tps65910_irq(struct tps65910 *tps65910,
31 return (irq - tps65910->irq_base);
35 * This is a threaded IRQ handler so can access I2C/SPI. Since all
36 * interrupts are clear on read the IRQ line will be reasserted and
37 * the physical IRQ will be handled again if another interrupt is
38 * asserted while we run - in the normal course of events this is a
39 * rare occurrence so we save I2C/SPI reads. We're also assuming that
40 * it's rare to get lots of interrupts firing simultaneously so try to
43 static irqreturn_t tps65910_irq(int irq, void *irq_data)
45 struct tps65910 *tps65910 = irq_data;
51 wake_lock(&tps65910->irq_wake);
52 tps65910->read(tps65910, TPS65910_INT_STS, 1, ®);
54 tps65910->read(tps65910, TPS65910_INT_STS2, 1, ®);
56 switch (tps65910_chip_id(tps65910)) {
58 tps65910->read(tps65910, TPS65910_INT_STS3, 1, ®);
62 tps65910->read(tps65910, TPS65910_INT_MSK, 1, ®);
64 tps65910->read(tps65910, TPS65910_INT_MSK2, 1, ®);
66 switch (tps65910_chip_id(tps65910)) {
68 tps65910->read(tps65910, TPS65910_INT_MSK3, 1, ®);
69 irq_mask |= reg << 16;
76 wake_unlock(&tps65910->irq_wake);
80 for (i = 0; i < tps65910->irq_num; i++) {
82 if (!(irq_sts & (1 << i)))
85 handle_nested_irq(tps65910->irq_base + i);
88 /* Write the STS register back to clear IRQs we handled */
91 tps65910->write(tps65910, TPS65910_INT_STS, 1, ®);
93 tps65910->write(tps65910, TPS65910_INT_STS2, 1, ®);
94 switch (tps65910_chip_id(tps65910)) {
97 tps65910->write(tps65910, TPS65910_INT_STS3, 1, ®);
99 wake_unlock(&tps65910->irq_wake);
103 static void tps65910_irq_lock(struct irq_data *data)
105 struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
107 mutex_lock(&tps65910->irq_lock);
110 static void tps65910_irq_sync_unlock(struct irq_data *data)
112 struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
116 tps65910->read(tps65910, TPS65910_INT_MSK, 1, ®);
118 tps65910->read(tps65910, TPS65910_INT_MSK2, 1, ®);
119 reg_mask |= reg << 8;
120 switch (tps65910_chip_id(tps65910)) {
122 tps65910->read(tps65910, TPS65910_INT_MSK3, 1, ®);
123 reg_mask |= reg << 16;
126 if (tps65910->irq_mask != reg_mask) {
127 reg = tps65910->irq_mask & 0xFF;
128 tps65910->write(tps65910, TPS65910_INT_MSK, 1, ®);
129 reg = tps65910->irq_mask >> 8 & 0xFF;
130 tps65910->write(tps65910, TPS65910_INT_MSK2, 1, ®);
131 switch (tps65910_chip_id(tps65910)) {
133 reg = tps65910->irq_mask >> 16;
134 tps65910->write(tps65910, TPS65910_INT_MSK3, 1, ®);
137 mutex_unlock(&tps65910->irq_lock);
140 static void tps65910_irq_enable(struct irq_data *data)
142 struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
144 tps65910->irq_mask &= ~( 1 << irq_to_tps65910_irq(tps65910, data->irq));
147 static void tps65910_irq_disable(struct irq_data *data)
149 struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
151 tps65910->irq_mask |= ( 1 << irq_to_tps65910_irq(tps65910, data->irq));
154 #ifdef CONFIG_PM_SLEEP
155 static int tps65910_irq_set_wake(struct irq_data *data, unsigned int enable)
157 struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
158 return irq_set_irq_wake(tps65910->chip_irq, enable);
161 #define tps65910_irq_set_wake NULL
164 static struct irq_chip tps65910_irq_chip = {
166 .irq_bus_lock = tps65910_irq_lock,
167 .irq_bus_sync_unlock = tps65910_irq_sync_unlock,
168 .irq_disable = tps65910_irq_disable,
169 .irq_enable = tps65910_irq_enable,
170 .irq_set_wake = tps65910_irq_set_wake,
173 int tps65910_irq_init(struct tps65910 *tps65910, int irq,
174 struct tps65910_platform_data *pdata)
177 int flags = IRQF_ONESHOT;
181 dev_warn(tps65910->dev, "No interrupt support, no core IRQ\n");
185 if (!pdata || !pdata->irq_base) {
186 dev_warn(tps65910->dev, "No interrupt support, no IRQ base\n");
190 /* Clear unattended interrupts */
191 tps65910->read(tps65910, TPS65910_INT_STS, 1, ®);
192 tps65910->write(tps65910, TPS65910_INT_STS, 1, ®);
193 tps65910->read(tps65910, TPS65910_INT_STS2, 1, ®);
194 tps65910->write(tps65910, TPS65910_INT_STS2, 1, ®);
195 tps65910->read(tps65910, TPS65910_INT_STS3, 1, ®);
196 tps65910->write(tps65910, TPS65910_INT_STS3, 1, ®);
197 tps65910->read(tps65910, TPS65910_RTC_STATUS, 1, ®);
198 tps65910->write(tps65910, TPS65910_RTC_STATUS, 1, ®);//clear alarm and timer interrupt
200 /* Mask top level interrupts */
201 tps65910->irq_mask = 0xFFFFFF;
203 mutex_init(&tps65910->irq_lock);
204 wake_lock_init(&tps65910->irq_wake, WAKE_LOCK_SUSPEND, "tps65910_irq_wake");
205 tps65910->chip_irq = irq;
206 tps65910->irq_base = pdata->irq_base;
208 switch (tps65910_chip_id(tps65910)) {
210 tps65910->irq_num = TPS65910_NUM_IRQ;
213 tps65910->irq_num = TPS65911_NUM_IRQ;
217 /* Register with genirq */
218 for (cur_irq = tps65910->irq_base;
219 cur_irq < tps65910->irq_num + tps65910->irq_base;
221 irq_set_chip_data(cur_irq, tps65910);
222 irq_set_chip_and_handler(cur_irq, &tps65910_irq_chip,
224 irq_set_nested_thread(cur_irq, 1);
226 /* ARM needs us to explicitly flag the IRQ as valid
227 * and will set them noprobe when we do so. */
229 set_irq_flags(cur_irq, IRQF_VALID);
231 irq_set_noprobe(cur_irq);
235 ret = request_threaded_irq(irq, NULL, tps65910_irq, flags,
236 "tps65910", tps65910);
238 irq_set_irq_type(irq, IRQ_TYPE_LEVEL_LOW);
241 dev_err(tps65910->dev, "Failed to request IRQ: %d\n", ret);
246 int tps65910_irq_exit(struct tps65910 *tps65910)
248 if (tps65910->chip_irq)
249 free_irq(tps65910->chip_irq, tps65910);